Balancing machine



April 3,1928. 1,665,138

J. LUNDGREN BALANCING mcnmn Fil ed April 24. 1923 asnaats-sneet .1

April 3, 1928.

J. LUNDGREN I BALANCING MACHINE 3 Sheets- Shah's 2 Filed April 24. 1923 J. LUNDGREN BALANCING MACHINE Filed April 2'4. 1925 a Sheets-Shet 3 Patented Apr. 3, 1928.

UNITED STATES, PATENT OFFICE.

' JACOB LUNDGREN, OFPHILADELZPHIA, PENNSYLVANIA, ASSIGNOR TO TINIU'S OLSEN TESTING MACHINE COMPANY, OF IPHILADELPHIA, PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA.

BALANCING MACHINE.

Application m April 24, 1923. Serial No. 634,334.

This invention relates to devices for locating and correcting unbalance in bodies designed for rotation, and one object of the invention is to provide a simple, accurate and convenient machine ofthe type noted.

Another object of the invention is to provide a balancing machine by which it shall be possible not only to quickly locate the points on a rotary body at which balancing corrections should be made, but which shall be of such a nature as to give correct readings of the amounts of the corrections required.

I also desire to provide a machine whereby it shall be possible with twocorrections to conipletely balance or completely correct the unbalance of a rotatable body.

These objects and other advantageous ends I attain as hereinafter set forth, reference plan of the machine shown in transverse knife edges 44 and including longitudinally extending racks 5-5 respectively engaged by gears 6-6 fixed to a trimsverse shaft 7 journaled in the base'l. This shaft projects at one side of the frame where it is provided with a head 8 which permits of its convenient adjustment. Rotation of said head, through the gears 6 and the racks 5, will shift the carriage 3 and with it the two knife edges 4 longitudinally of the base 1.

Supported for the most part, on the knife edges 4 is an elongated rectangular frame including two parallel side members 99 and two end members 10 and 11 connecting said side members,-the under face of the side members 9 being fiat adjacent and in engagement with the knife edges 4 to permit of a relative sliding adjustment of the latter. Projecting from the end member 10 is a bracket 12 perforated for the passage of a vertically extending bolt 13 whose lower end is fixed in a bracket 14 mounted on the end of the base 1. Coaxial with this bolt are two springs 15 and 16, of which the first is confined between the brackets 12 and 14 and the second between the bracket 12 and a nut 17 adjustably mounted on the upper end. of. said bolt. i

At the opposite end of the machine a pair of arms 1818 projects from the member 11 and carries a plate 18 perforated "for the passage of a bolt 19 whose lower end is fixed to a bracket 20 mounted on the adjacent end of the base 1. Two springs 15 and 16* are confined on this bolt,the first between the bracket 20 and the plate 18 and the second between said plate and a nut 21 adjustably threaded on said bolt. From the above description, it will be appreciated that the frame is carried upon the two knif 44 and is steadied at its ends by the two pairs of spring 1516 and- 15 and 16". I

To prevent movement of the frame 9-9-'- 10-11 longitudinally of the base, I provide on one of the side members 9 an inwardly projecting arm 22 and mount a tie member 23 in the form of a flexible bar or ribbon so as to extend therefrom to an arm or bracket 24 on one end of the base. It is-to, be understood that this tie member 23 is flexible so as to permit of limited oscillatory movement of the frame 991011 knife edges.

on its supporting ev edges In accordance with my invention, I mount on one end of oscillatory frame a transversely extending; driving shaft 25, having splined to it a driving pulley 26' or other element designed to be actuated from a suitable source of power such as a motor (not shown) pref- I 'erably'mounted on said frame. Said shaft is longitudinally adjustable through its hearing and for this purpose is provided on one end with a collar 27 loose upon and confined between a milled head 28 and a suitable shoulder of said shaft. The collar 27 is provided with a projecting tooth 29 designed to coact with the teeth of a ratchet 30 fixed to and projecting from one of the side members 9 of the frame. By this means said shaft may be adjusted longitudinally of its bearings and maintained in any given position.

.The shaft 25 has fixed to it a worm 31 meshing with a worm wheel 32 fixed to a shaft 33 journaled in suitable bearings so as tobe rotatably suppxorted in one central longitudinal lane of t e oscillatory frame. The forwar end of this latter shaftis provided with a suitable chuck or coupling member 34 and is aligned with a pair of bearings 35 and 36 adjustably carried by the side members 9-9 of said frame. For this purpose said bearings are formed as part of bars or cross members 37 and 38 whose ends are slidably adjustable on the side members 99. Moreover, the adjacent ends of said cross bars are tiedtogether by plates 3939 each of. which has one end fixed to a cross bar 38, for example, by suitable means such as a screw 40, while its opposite end is longitudinally slotted, as indicated at 41, for the reception of a second screw 42 whereby the second cross bar 37 may be clam ed at any desired distance from the cross ar 38. The bearings and 36 are designed to receive and rotatably support the object,

such as a motorarmature, which is to be balanced, and as above noted, are suitably aligned with the shaft 33 to permit of the latter being coupled to the shaft of said armature, by the member 34.

Also carried by 99-10-*11, parallel with and immediatethe oscillatory frame ly below the shaft 25, is a second transverse and from. said other weight 50.

shaft 43 having fixed thereon agear 44 mesh in with a second driving shaft 25. T is second shaft '43 has fixed to it a worm 46 meshing with the 'worm wheel 47 fixed to a shaft 43 extending longitudinally of the oscillatory frame and car- I that when in one adjustedfiosition they are balanced so that they wit the shaft may be rotated without causing gyratory stresses in said shaft and in the structures connected thereto. When, however, the weight 49 is moved longitudinally of the shaft awa from the weight 50, the resulting unba ance sets up gyratory forces whose magni tude is proportional to the speed of rota-.

tion and to the distance between the weights.

For the purposeof adjusting the relative positions of the weights 49 and 50 I journal a shortshaft 52 in suitable bearings car -ried by one of the frame members 9' and mount on the inner end of said shaft a ear 53. meshing with a rack54 extending on-' gitudinally of said frame carrying an arm 51 engaging the collar 51 of the weight 49.

ear 45 splined to the The outer end of said shaft 52 is provided with an indicating dial 55 and a mil ed head 56 to permit of its being convenientlyturned, and I also provide a pointer or mdicator 57 on the side frame member 9 in position tocooperate with the graduations of said dial. The latter'is designed to glve a zero reading when the weights 49-50 lie with their centers of gravity in the same plane at right angles to theshaft 48 and said dial is graduated in any convenient units such as inch-ounces or foot-pounds.

For indicating the presence and magnitude of oscillatory movement of the frame 9-91011, I provide a vertically extending standard 60 projecting upwardly from the base 1 at one side thereof and on its upper end mount a graduated indicating dial 61. On the adjacent side member 9 of the frame, I also provide an upwardly extending arm 62 placed to extend vertically to one side of the median transverse plane of said frame and through suitable mechanism connect the upper end of this arm 62 with a' pointer 6 3 journaled concentrical-' ly of the dial, 61, the arrangement being such that an oscillatory nrovement of the arm 2 will cause a proportional oscillatory move out of said pointer. a

With the above described arrangement of parts, the bearings 35 and 36 are adjusted to suitably receive and support the armature or other object w whose balance it is desired to correct, and the shaft of this object is cou pled to the member 34'of the shaft 33. The head or handle 8 of the shaft 7 is now turned to set the knife edges 4 in a vertical plane intersecting some part of the rotating body 36 and the shaft 48 with the weights 49 and 50 will likewise be. rotated at the same:

speed. Unless the rotating body is in perfect balance, this rotation will cause the frame 9-910-11 and hence the pointer 63 attached thereto to vibrate, and by means of the head 56, the counterbalancing weights 49 and 50 may be moved apart ormay be adjusted relatively to each other until this vibration ceases or becomes a minimum. Y By longitudinally adjusting the shaft 25, the shaft 33 may then be turned to adjust the angular relation'of the rotary body to the counter-balancing weights 49 and 50, and this will usually 'a sin cause a resulting vibration of the osci atory frame as shown 3 by the oscillation of the .pointer 63. By

means of further adjustment of the counterbalancing weightsbbg turningthe head 56,

this vibration as re be pped or reduced to a'minim A reading may 'now be taken of the adpointer be added to its uppermost justment of the weights 49 and 50 as shown by the graduated dial 55 relatively to the 57, and correction of the unbalance so determined is made on the rotating body m in some convenient plane at right angles to its axis of rotation into which the knife edges 4.4: will subsequently be brought. As before indicated, the dial 55 is graduated in such units-that the reading indicated by the pointer 57 will required correction. In order that this correction may be made at the proper point of the periphery or in the proper plane of the body a, the shaft 25 is rotated by hand until the two counterweights 49 and 50 are in the vertical plane of the shaft 48. If the counterweight 50 nearest the object 00 is now the upper of the two weights, said object will be corrected for unbalance if material ortion by the rom the plane by the reading amount and at the distance of the knife edges indicated of the dial 55. a

The carriage 3 is now adjusted by rotating the head 8 until the vertical plane of the knife edges-H is made coincident with the plane in which correction has been or should be made on the body :2. The machine is now again put in operation and if after as above explained,

rotating body.

as is usually the case, unbalance is indicated by vibration' of the oscillatory frame 99-1011 on the knife edges 4.4 as previously explained, this is again brought to zero or reduced to a minimum by adjust ing the distance between the counterweights 4950 by rptation of "the head 56. Theretheangular relation of the two. counterweights and the r0- tat-ing body m is adjusted by longitudinal adjustment of the shaft 25 and any resulting vibration of the frame is again reduced to zero by further adjustment of the head 56. The reading of the dial 55 will now indicate in inch-ounces or other convenient unit the amount of the correction to be made to the This correction is to be made at a point on the body an in the vertical plane originally defined by the knife edges 44 and positioned at this point on the periphery ofthe body determined as above explained.

As a result of the above operations, it will be found that the body 02 is in complete static as well as in complete dynamic balanceand it will be appreciated that the balancing operation may be quickly and conveniently accomplished highest degree of accuracy.

It is to be noted that it is not necessary to correct the unbalance until both readings have been taken as described above.

I claim: a 1,. The combination ina balancing machine of a supporting structure providing a movable fulcrum; an oscillatory frame give the amount of the and that with the mounted on said structure; adjustable counterbalance weights on the frame; means also on the frame for supporting a body to be balanced; means for simultaneously rotating said body and the counterbalance weights; with means including a longitudinally/"adjustable shaft for varying the angular relation of said Weights and the body to be balanced.

anced; a devicealsocarried by the frame for determining the amount of unbalance of 2. The combination of a bodily movable said body for different positions of saidmember, said device including a pair of adjustable counterbalancing weights; means for adjusting the distance between said weights; and means includinga bodily movable shaft for adjusting the angular relation of the counterweights and the rotating body.

8. The combination in a balancing machine of a supporting structure providing -a bodily movable-fulcrum; an oscillatory frame mounted on said structure; two shafts rotatably carried by said frame; means for rotating said shafts including an axially movable shaft for adjusting theangular relation between said first-mentioned shaft;

counterbalance weights actuated by one of said shafts; bearings on the frame for rotatably supporting a body to be balanced in line with and coupled to the second shaft; means for adjusting the counterweights toward and from each other; and. means for indicating the oscillation of said .frame for different positions of said movable fulcrum 4. The combination in a balancing .m achine of asingle fulcrum structure; an osclllatory frame mounted thereon; springs engaging the opposite ends of said frame for rotatably supporting a body to be balanced;

.counterbalance weights also carried by the' frame; means including apair ofshafts for synchronously rotating said Weights and body in said bearings; means for adjusting the distance between the counterweights-to reduce the oscillation of the frame due to unbalance of the body carried thereby when the latter is rotated; a device connected with said last means for indicating the amount of correction to be made in said body; one of said shafts being longitudinally movable to vary the angular relation of thebody to be balanced and thecounterbalance weights.

5. The combination .in"-a balancing machine of a supporting structure; a pair of knife edges slidably mounted 'on said structure; means for sliding said knife edges on the structure from one desired position to another; a frame fulcrumed onthe knife edges; longitudinallyextending means for preventing longitudinal movement of. said frame while permitting its oscillation; countel-balancing weights carried by the-frame;

means for simultaneously rotating said weights 'anda body to be balanced; and means for determining the balance of said body when it is rotated with said knife edges successively in said desired positions.

6. A balancing machine comprising a frame for supporting a body to be tested; counterbalancing means; a pair of parallel shafts mounted on said .frame and respectively associated with said body and said counterweights, said shafts being formed to constitute elements of worm-and-wheel gearjustable longitudinally of the dther, whereby the-angular relation between said shafts may and said body,

oscillatory frame providing a-body' to be tested and weights and saidjbody,

be varied.

8. A- balanc ng machine c prising a frame for suporting a bod to he tested;

counterbalancing means; an nected shafts mounted respectively associated weights and said body, longitudinally adjustable, whereby the angular relation between said body and said counterbalancing means may be varied.

9. A balancing machine comprising a frame for supporting a body to be tested counterbalancing means; a pair of connected a pair of conon 831d frame and wlth said countershafts mounted on said frame and 1eSP. C-

tively associated with said. counterweights the latter shaft being long'iv tudinally adjustable, whereby the angular relation between the body and said'counter balancing means may be varied and locking means for said longitudinally-movable shaft.

10. A' balancing machinev comprising an balancing weights; and a pair of connected shafts respectively associated with said the latter shaft constituting a driving shaft and so mounted as to be movable longitudinally independently of the other shaft, whereby the angular relation between said body and said counter weights maybe varied."

11. A balancing machine comprlsmg a frame for supporting .a' bodyto be tested;

amount of un-- the latter shaft being a mounting. for also for countercounterbalancing means; a pair of shafts} and means for connecting the same, said shafts being respectively associated with said body and said counterweights and formed to constitute elements of worm-and- I wheel mechanism, one of the shafts being axially movable so as to vary the angular position between said body and said 'counterbalancing means.

12. In combination,

a body to betested; counterbalancing means; 221d axially movable driving shaft for said 5 and provided with a worm; means for locking said shaft in any one of a number of positions; and a shaft for actuating said counterbalancing means supporting means for adapted to be driven by mounted on said supporting means said axially movable shaft and provided with a worm.

13. A balancing machineincludingan os- I cillatory frame, and a 'pair of connected shafts carried thereby, said shafts being formed to constitute elements of worm-and- Wheel gearing, one of said shafts being so mounted as to be adjustable longitudinally of the other, whereby the angularrelation of said shafts may be varied.

MIA balancing machine comprising an oscillatory frame adapted to provide a mounting for a body to be tested; said frame also providing a mounting for counterbalancing weights, a pair of connected shaft-s for respectively actuating said body and said weights, said. shafts being formed to constitute elements of worm-and-wheel one of said shafts being adjustable ongitudinally of the other, whereby the "angular relation of said body and said counterweights may be varied, and means for locking said longitudinally movable shaft.

15..A,balancing machine comprising an oscillatory frame adapted to provide a mounting for a body to be tested, said frame also providing a mounting for counterbalancingweights, a pair ofconnected shafts for respectively actuating said body and said weights, said shafts being formed to constitute elements of worm-and-wheel gearof the other, whereby angular relation of said body and said counter:

weights may be varied; and ratchet mecha-' nism for adjustably securing said longitue dinally movable shaft in a desired position.

16. -Means for balancing a rotating body including, a supporting fulcrum, means for bodily moving said fulcrum from one desired position toanother, counterbalancing means, a drivin shaft, and means forlaxially adjusting the driving shaft to vary. the angular relation between said body and said counterbalancing means.

JACOB caring,

one of said shafts being adjustable lon- V gitudinally 

